Locomotive.



J LEC- DAVIS.

LQCOMQTIVE.

' APPUCATION mu) IAN 10, '90s. 1,138,638, Patented May 11, 1915.

' 3 SHEETS-SHEET I.

E: E: E [:3

WITNESSES: Q 'aygm g 3. LECNBAVIS LOCOMOTIVE APPLICATIGN mm mm. :0. 190a.

Yatcntv May 11, 1915.

3 SHEETS-SHEH 2- ATTORNEY WlTNhSSES XVMi/M J. LEG. DAVIS.

LOCOMOTIVE- APPLICATION FILED JAN. I0. 1908.

1,138,638. Patented May 11, 19 15.

3 SHEETS-SHEET 3. 7 9' 4 1 HI a 1 16 mgmoa v 4 BY 4 I TTORNEY UNITED s'raas ATE rrica.

JOSEPH LE COHTE DAVIS, OF PITTSBUBGfi, PENNSYLVANIA, ASSIGNOB, BY HESE ASSIGNMENTS, T WESTINGHOUSE ELECTRIC 81 MANUFACTURING COMPANY, OF EAST PITTSBURGH, PENNSYLVANIA, A. CORPORATION OF PENNSYLVANIAv LOCOMOTIVE.

Todlltvhomitma concern:

Be it known t at I, Josm'n Ln Cox'ri:

' DAVIS, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Locomotives, of which the -following is a specification.

My invention relates to electric locomo- 1o tives and to driving motors therefor, and it view, in side elevation, of a locomotive con- 7 in accordance therewith. Fig. 1

inc diagrammatic side elevation of the mo tor field magnet frame and armatures. Fig.

2 is a ditic view of the circuit connections of the locomotive. Fig. 3 is a top lan view of the locomotive. Fig. 4 is a vertical sectional view on the line IV-IV of Fig. 1, and Fig. 5 is a pejrspective view of the field magnet frame of the locomotiie.

Mounted upon and ri 'dly secured to axles 1 and 2 that carry the riving wheels of the locomotive are armatures 3 and 4 of the propelling motors. The motors are provided 'with a common field magnet frame 5 comprising three polar projections 6, 7, and 8 aving long concave side faces between which the 'matures 3 and 4 are located, the lower port ions 9, 10, and 11 of the polar projections being detachable in order to permit of ready insertion and removal of the armatures into and from their operative positions. The middle polar projection 7 is provided with a winding comprising two sections 12 and 13 that may beconnected either in series or in parallel relation in order to obtain variable speeds of operation by means of any suitable controller 14.

The field magnet frame 5 is supported by means of, a truck frame comprising two side plates 15 and 16, to which the field magnet frame 5 is secured by means of bolts 17, and two end' pieces l i and 19 adapted to secure the side plates 15 and 16 together and to accommodate a motorman or other op erator. The truck frame is resiliently supported upon journal bearings 20 by means of helical compression springs 21, and, in

Patented May 11, 1915.

Application fled January 10, 190a semi no. 410,228.

order to permit of a slight amount of relative movement between the armatures and polar projections of the motors, the curvature of the concave faces of the polar pmect ons made such that there is normally a wider air-gap between the upper side port ons of the armatures and the adjacent portions of the pole faces than between the lower side portions of the armatures and the ad acent lower portions of the pole facesa The magnetic attraction between the lower rtions of the polar irojections and the ower side fore norina y tends to raise the truck frame and the attached parts and to therehv re heve the springs 21 of a portion of the weight thereof, this result being efiected by reason of the dimensions form and location of the pole ieces as well as by the dill'erence in widt of certain portions of the air gaps, as above set forth. I

I claim as my invention:

1. An electric locomotivehaving a short wheel base and comprising a horizontal! magnetlzab e yoke provided wit 1 three integral downwardly projecting pole pieces having free emh, armatures rotatably mounted between the middle and outer pole plecs and a winding surrounding the mid dle pole piece and disposed above the armatures. I

2. An electric locomotive having a short wheel base and comprising a horizontally portions of t e armatures theredisposed magnetizable yoke provided with pole piece, and aimatures rotatably mountk "Yd between the middle and outer pole pieces.

4. The combination with a pair of driving axles, and armatures carried thereby, of side and a field magnet frame -se- 125 height of the cured thereto and resiliently supported upon the axles and comprising a substantially horizontal yoke and three downwardly pro- {ecting' pole pieces having unconnected 5 ower ends and provided with long concave side faces between which the armatures are located.

5. The combination with a pair of driving axles, and armatures carried thereby, of a field magnet frame resiliently supported upon the axles and comprising a substantially horizontal yoke and three downwardly projecting pole pleces having unconnected lower ends and provided with long concave side faces between which the armatures are located, and a field magnet winding sur rounding the middle pole piece above said armatures.

6. In a locomotive, the combination with side frames and a unitary magnetizable yoke secured thereto to constitute the locomotive body and embodying three integral downwardly projecting pole pieces, said yoke and said pole pieces being disposed within the side frames, ofarmatures rotatably mounted between the middle and outer pole pieces.

7. In a locomotive having a short wheel base, the combination with side frames and 30 a unitary magnetizable yoke secured thereto to constitute the locomotive body and ema bodying three integral downwardly projecting pole pieces of less width than the width of the yoke, said yoke associated pole pieces being disposed within the height of the side frames, of armatures rotatably mounted between the middle and outer pole pieces and concentric field magnet coils surrounding the upper'portion of said middle pole pieces.

8. In a minin locomotive having a. wheel base substantial y equal to the diameter of the wheels, the combination with a pair of driving axles having driving wheels, armatures mounted lipon said axles and a locomotive body resiliently supported by said axles and comprising a magnetizable hori zontal yoke and side frames secured to the sides thereof, said yoke ing provided with :e downwardly projecting integral pole .a-ces disposed within the height of the side frames, of a plurality of separated concentric field magnet coils surrounding the mid dle pole pieces above said annatures and berieath said yoke.

9. The combination with a pair of driving axles, and armatures mounted thereon, of a field magnet frame resiliently supported upon the axles and comprising a substantially horizontal yoke and three downwardly projecting'pole pieces having long concave side faces between which the armatures are located, the curvature of the pole faces being such that the air gaps between the a-rmatures and the lower portions of the. pole faces are narrower than those between the armatuies and the upper portions of said faces.

In testimony whereof, I have hereunto sugszcribedmy name this 27th day of Dec, 19

JOSEPHLE CONTE DAVIS.

Witnesses: 4

J. D. 'Fonnnn, BmNmr HrNns. 

